“There have been occasional sightings of killer whales in Wales, and it is thought that these individuals are part of a group known as the West Coast Community which are normally seen around the Hebrides in Scotland." She said.

"It is very exciting to see them off North Wales – it goes to show just how special our Welsh waters really are.”

The West Coast Community consists of just eight killer whales – four males and four females – but no calves have been spotted in the pod for around 25 years.

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RSPB North Wales also posted about the “surprise visitors” on their Facebook page.

They said: “Wonderful surprise visitors at South stack today, orca/killer whale two of them! They could be seen for a few hours from the range moving around to north stack. You never know what you will spot out to sea on a calm day.”

The RSPB said that the sighting has been reported to the Sea Watch Foundation who monitor the number and locations of whales, dolphins and porpoises in a bid to help protect them.